If you can’t quite handle a flask full of straight alcohol and must have a mixed drink instead, avoid citrus. Citrus drinks can make your flask’s contents taste metallic. Nothing is more disappointing than looking forward to a lemon–lime surprise and getting a mouth full of metal.
Don't let it marinate. The best mixed drink of all time won’t taste good after a day of stewing, especially if it has absorbed the flask’s metal.
Splurge. Your flask is your saving grace and you’re going to be drinking it warm so don’t be afraid to use your best alcohol. The only thing worse than a mouthful of Bankers is a mouthful of warm Bankers.
Editor’s Pick: Best Mixed Drink for Flasks
Three oz. Wild Turkey Bourbon
One and one–half oz. vermouth
A small, scored piece of orange peel (it’s barely citrus, shut up)